Method for diagnosing nitrogen oxide sensor associated to exhaust gas tract of internal combustion engine, involves determining waiting time, after which nitrogen oxide concentration has determined threshold value after switching engine

摘要

The method involves determining a waiting time, after which the nitrogen oxide concentration has a determined threshold value after switching an internal combustion engine. The nitrogen oxide concentration is present at the position of the nitrogen oxide sensor. A zero-point difference of the nitrogen oxide sensor is determined by watching the waiting time after switching of the internal combustion engine. A signal supplied from the nitrogen oxide sensor is detected and the zero-point difference is determined from the signal. An independent claim is included for an internal combustion engine with a waiting time determination unit.